<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Reference</title>
<style>
#scrollContainer {
  overflow: scroll;
  font: 16px / 32px serif;
  height: 3lh;
  border: 1px solid black;
}
.clamp {
  padding: 4px;
  background-color: yellow;
}
.pre {
  white-space: pre;
}
</style>

<div id="scrollContainer">

  <div class="clamp">
    <div class="pre">Line 1
Line 2
Line 3
Line 4…</div>
  </div>

</div>

<script>
  window.addEventListener("load", () => {
    const scrollContainer = document.getElementById("scrollContainer");
    scrollContainer.scrollTop = scrollContainer.scrollHeight;
  });
</script>
